Chegg Textbook Solutions for Physical Science 7th Edition: Chapter 20

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Mechanical weathering is the physical breaking up of rocks
without any changes in the chemical composition of the rock.
Chemical weathering is the breakdown of minerals by chemical
reactions with water, gases of the atmosphere, or solutions. Both
act to break down rocks, but mechanical weathering breaks the rocks
into smaller and smaller pieces of the original rock. Chemical
weathering dissolves or breaks down the minerals of the rock into
new compounds.

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